Gillespie Lake Dam Reservoir Report

Last Updated: December 18, 2025

Gillespie Lake Dam, situated in Gentry, Missouri, along the TR-East Fork Grand River, is a privately owned structure primarily used for recreation purposes.


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Summary

Constructed in 1977, this earth dam stands at a height of 25 feet and can store up to 40 acre-feet of water, making it a vital water supply source for the area. With a surface area of 3 acres and a drainage area of 90 acres, this dam serves as a key recreational spot for residents and visitors alike.

Despite its low hazard potential, Gillespie Lake Dam has not been rated for its condition assessment, and no inspection frequency has been documented. The dam's core type is buttress, and its foundation type is listed as unlisted/unknown. While the dam has not been modified in recent years, its emergency action plan status, risk assessment, and risk management measures remain unknown.

Located within the Rock Island District, Gillespie Lake Dam provides a serene setting for outdoor activities and serves as a crucial water supply source for the surrounding community. Its historical significance and recreational value make it a beloved landmark in the region, attracting water resource and climate enthusiasts to admire its beauty and importance in sustaining the local ecosystem.

Year Completed

1977

Dam Height

25

River Or Stream

TR-EAST FORK GRAND RIVER

Primary Dam Type

Earth

Surface Area

3

Drainage Area

90

Nid Storage

40

Structural Height

25

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

25
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.